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What does 350 mean?

350 is more than a number—it's a symbol of where we need to head as a planet. To preserve our planet, scientists tell us we must reduce the amount of CO2 in the atmosphere from its current levels to 350 parts per million (ppm) - the safe limit to support life as we know it.

Learn more about 350—what it means, where it came from, and how to get there.
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